Hello, evrerybody. Is there any extinction file for APO to calibrate spectroscopy data? If not, is it ok to use the for KPNO available in Iraf libraries? Thank you. Gastón Folatelli. APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 84 in the apo35-dis archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-dis/INDEX.html APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-dis@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO